Debian DSA-3629-1 : ntp - security update

high Nessus Plugin ID 92571
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The remote Debian host is missing a security-related update.


Several vulnerabilities were discovered in the Network Time Protocol daemon and utility programs :

- CVE-2015-7974 Matt Street discovered that insufficient key validation allows impersonation attacks between authenticated peers.

- CVE-2015-7977 CVE-2015-7978 Stephen Gray discovered that a NULL pointer dereference and a buffer overflow in the handling of 'ntpdc reslist' commands may result in denial of service.

- CVE-2015-7979 Aanchal Malhotra discovered that if NTP is configured for broadcast mode, an attacker can send malformed authentication packets which break associations with the server for other broadcast clients.

- CVE-2015-8138 Matthew van Gundy and Jonathan Gardner discovered that missing validation of origin timestamps in ntpd clients may result in denial of service.

- CVE-2015-8158 Jonathan Gardner discovered that missing input sanitising in ntpq may result in denial of service.

- CVE-2016-1547 Stephen Gray and Matthew van Gundy discovered that incorrect handling of crypto NAK packets may result in denial of service.

- CVE-2016-1548 Jonathan Gardner and Miroslav Lichvar discovered that ntpd clients could be forced to change from basic client/server mode to interleaved symmetric mode, preventing time synchronisation.

- CVE-2016-1550 Matthew van Gundy, Stephen Gray and Loganaden Velvindron discovered that timing leaks in the packet authentication code could result in recovery of a message digest.

- CVE-2016-2516 Yihan Lian discovered that duplicate IPs on 'unconfig' directives will trigger an assert.

- CVE-2016-2518 Yihan Lian discovered that an OOB memory access could potentially crash ntpd.


Upgrade the ntp packages.

For the stable distribution (jessie), these problems have been fixed in version 1:4.2.6.p5+dfsg-7+deb8u2.

See Also

Plugin Details

Severity: High

ID: 92571

File Name: debian_DSA-3629.nasl

Version: 2.17

Type: local

Agent: unix

Published: 7/27/2016

Updated: 1/11/2021

Dependencies: ssh_get_info.nasl

Risk Information


Risk Factor: Medium

Score: 4.4


Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

Vector: AV:N/AC:M/Au:N/C:N/I:N/A:C

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: High

Base Score: 7.7

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:ntp, cpe:/o:debian:debian_linux:8.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 7/25/2016

Vulnerability Publication Date: 1/26/2016

Reference Information

CVE: CVE-2015-7974, CVE-2015-7977, CVE-2015-7978, CVE-2015-7979, CVE-2015-8138, CVE-2015-8158, CVE-2016-1547, CVE-2016-1548, CVE-2016-1550, CVE-2016-2516, CVE-2016-2518

DSA: 3629